Hey guys I'm new to this so I need some opinions please. I have a fully established 20long with a diy 10 sump/refugium. I just purchased a used 125 gallon with drilled corner overflows and returns. It was a fish only tank and the guy was running a 10 gallon wet/dry system. There's no room for a single tank for sump so I'm wanting to run 3 10 gallon tall tanks from glasscages.com and drill them with bulkheads. 1st tank will have skimmer filter sock 2nd tank refugium and 3rd tank return. Thanks for your time.